/**
 *    Copyright (C) 2014 MongoDB Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/base/owned_pointer_vector.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/range_deleter_service.h"

namespace mongo {

    /**
     * Server status section for RangeDeleter.
     *
     * Sample format:
     *
     * rangeDeleter: {
     *   lastDeleteStats: [
     *     {
     *       deleteDocs: NumberLong(5);
     *       queueStart: ISODate("2014-06-11T22:45:30.221Z"),
     *       queueEnd: ISODate("2014-06-11T22:45:30.221Z"),
     *       deleteStart: ISODate("2014-06-11T22:45:30.221Z"),
     *       deleteEnd: ISODate("2014-06-11T22:45:30.221Z"),
     *       waitForReplStart: ISODate("2014-06-11T22:45:30.221Z"),
     *       waitForReplEnd: ISODate("2014-06-11T22:45:30.221Z")
     *     }
     *   ]
     * }
     */
    class RangeDeleterServerStatusSection : public ServerStatusSection {
    public:
        RangeDeleterServerStatusSection() : ServerStatusSection( "rangeDeleter" ){}
        bool includeByDefault() const { return false; }

        BSONObj generateSection(const BSONElement& configElement) const {
            RangeDeleter* deleter = getDeleter();
            if (!deleter) {
                return BSONObj();
            }

            BSONObjBuilder result;

            OwnedPointerVector<DeleteJobStats> statsList;
            deleter->getStatsHistory(&statsList.mutableVector());
            BSONArrayBuilder oldStatsBuilder;
            for (OwnedPointerVector<DeleteJobStats>::const_iterator it = statsList.begin();
                 it != statsList.end(); ++it) {
                BSONObjBuilder entryBuilder;
                entryBuilder.append("deletedDocs", (*it)->deletedDocCount);

                if ((*it)->queueEndTS.millis > 0) {
                    entryBuilder.append("queueStart", (*it)->queueStartTS);
                    entryBuilder.append("queueEnd", (*it)->queueEndTS);
                }

                if ((*it)->deleteEndTS.millis > 0) {
                    entryBuilder.append("deleteStart", (*it)->deleteStartTS);
                    entryBuilder.append("deleteEnd", (*it)->deleteEndTS);

                    if ((*it)->waitForReplEndTS.millis > 0) {
                        entryBuilder.append("waitForReplStart", (*it)->waitForReplStartTS);
                        entryBuilder.append("waitForReplEnd", (*it)->waitForReplEndTS);
                    }
                }

                oldStatsBuilder.append(entryBuilder.obj());
            }
            result.append("lastDeleteStats", oldStatsBuilder.arr());

            return result.obj();
        }
    } rangeDeleterServerStatusSection;
}
